Classification
620 - Engineering & allied operations
405
621 - Applied physics
320
530 - Physics
118
537 - Electricity & electronics
57
541 - Physical chemistry
35
535 - Light & infrared & ultraviolet phenomena
18
538 - Magnetism
16
543 - Analytical chemistry
13
547 - Organic chemistry
11
546 - Inorganic chemistry
9
539 - Modern physics
8
629 - Other branches of engineering
6
333 - Economics of land & energy
5
500 - Natural sciences & mathematics
5
610 - Medicine & health
5
660 - Chemical engineering
4
004 - Data processing & computer science
3
515 - Analysis
3
531 - Classical mechanics; solid mechanics
3
670 - Manufacturing
3
338 - Production
2
548 - Crystallography
2
003 - Systems
1
005 - Computer programming, programs & data
1
389 - Metrology & standardization
1
520 - Astronomy & allied sciences
1
536 - Heat
1
540 - Chemistry & allied sciences
1
571 - Physiology & related subjects
1
577 - Ecology
1
617 - Surgery & related medical specialties
1